Cutter apparatus

ABSTRACT

A cutter apparatus comprising a frame having a mounting member connectable to a piece of prime mover equipment; a cutter assembly connected to the frame, the cutter assembly comprising a support member having a first end; a drive shaft having a first end journaled to the first end of the support member; and a plurality of discrete cutter members stacked on the drive shaft so as to be engaged with an adjacent one of the cutter members, each of the cutter members having at least one cutting edge; and a drive assembly connected to the drive shaft in a way that activation of the drive assembly causes the drive shaft to rotate and thereby rotate the cutter members. The frame may have a base and an extension arm pivotally connected to the base. The support member may be pivotally connected to the extension arm.

CROSS REFERENCE TO RELATED APPLICATIONS

This patent application claims priority to Provisional PatentApplication U.S. Ser. No. 61/826,991 titled “IMPROVED TREE TRIMMER ANDBRUSH CUTTER,” filed on May 23, 2013, the entire contents of which arehereby expressly incorporated herein by reference.

BACKGROUND

Cutter devices may be used to cut trees, bushes, and other types ofvegetation. Vegetation cutting devices are often used to clear andmaintain road rights-of-way and fence lines. Prior art brush cutters andtree trimmers include rotary mowers, saw blades, and mulchers. Rotarymowers are mounted on the hydraulic boom of a tractor. One problemassociated with rotary mowers is the likelihood that the mower willexpel cut materials at a high rate of speed, creating a safety hazardfor individuals or vehicles near the mowers. The rotary mowers requirefrequent maintenance and sharpening of the mower blades, which may bedifficult and time consuming.

Other brush cutters include a series of spinning saw blades affixed to ahydraulic boom. The saw blade cutters are slow and require frequentrepositioning of the prime mover vehicle to reach the desiredvegetation, and sharpening the saw blades is a frequent, time consumingprocess. Additionally, the saw blade cutters can only cut a narrow swathof vegetation at one time.

Hydraulic mulchers are another form of brush cutters. Mulchers often usea large number of teeth affixed to a rotating drum. The teeth areexpensive and must be frequently replaced, which is a time consumingprocess. Additionally, mulchers cut a narrow swath and cut slowly.Hydraulic mulchers are also very heavy and put a great strain on theprime mover vehicle to which they are attached.

Accordingly, a need exists for a cutter apparatus that can be easily andvariably positioned and that can quickly and safely cut large swaths ofvegetation while improving cutting mechanism maintenance life and ease.It is to such an apparatus that the inventive concepts disclosed hereinare directed.

SUMMARY OF THE INVENTION

The present disclosure relates to a cutter apparatus for use, forexample, in cutting brush and trees. The cutter apparatus may comprise aframe having a mounting member connectable to a piece of prime moverequipment and a cutter assembly connected to the frame. The cutterassembly may comprise a support member having a first end and a secondend, a drive shaft having a first end and a second end, the first end ofthe drive shaft journaled to the first end of the support member, and aplurality of discrete cutter members stacked on the drive shaft so as tobe engaged with an adjacent one of the cutter members, each of thecutter members having at least one cutting edge. The cutter apparatusmay further comprise a drive assembly connected to the drive shaft in away that activation of the drive assembly causes the drive shaft torotate and thereby rotate the cutter members. The cutter apparatus mayuse the hydraulic power source of the prime mover vehicle to power thecutter apparatus.

The frame may comprise a base and an extension arm, the extension armhaving a first end pivotally connected to the base and a second endextending from the base. The first end of the support member may bepivotally connected to the second end of the extension arm. In oneembodiment, the base has a vertical axis and the extension arm ispivotally connected to the base about the vertical axis of the base, andthe extension arm has a horizontal axis and the first end of the supportmember is pivotally connected to the second end of the extension armabout the horizontal axis of the extension arm.

In one embodiment, the cutter members are slideable along the driveshaft when the first end of the support member is disconnected from thefirst end of the drive shaft.

In one embodiment, the cutter members each have a body with a top side,a bottom side, and a through-hole extending from the top side to thebottom side and centered in the body, the through-hole slidablyreceivable of the drive shaft, the cutter members further having a firstcutting edge and a second cutting edge arranged in a diametricallyopposed relationship and extending from the top side to the bottom sidein a parallel relationship to one another.

In one embodiment, the cutter members may be stacked on the drive shaftin a way that the first cutting edges and the second cutting edges arearranged in a helical pattern.

In one embodiment, the bottom side of the body of each of the cuttermembers has a notch for matingly receiving the top side of the adjacentcutter member.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are incorporated in and constitute apart of this specification, illustrate one or more implementationsdescribed herein and, together with the description, explain theseimplementations.

FIG. 1 is a perspective view of a cutter apparatus constructed inaccordance with the inventive concepts disclosed herein.

FIG. 2 is a top plan view of the cutter apparatus of FIG. 1.

FIG. 3 is a side elevational view of the cutter apparatus of FIG. 1.

FIG. 4A is a top plan view of a portion of a cutter assembly constructedin accordance with the inventive concepts disclosed herein

FIG. 4B is a perspective view of the portion of the cutter assembly ofFIG. 4A.

FIG. 4C is an exploded, perspective view of the section of the cutterassembly of FIG. 4A.

FIG. 5A is a perspective view of a cutter member constructed inaccordance with the inventive concepts disclosed herein.

FIG. 5B is a bottom plan view of the cutter member of FIG. 5A.

FIG. 6 is a side elevational view of a portion of the cutter assemblyand a drive assembly constructed in accordance with the inventiveconcepts disclosed herein.

DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS

Before explaining at least one embodiment of the inventive conceptsdisclosed herein in detail, it is to be understood that the inventiveconcepts are not limited in their application to the details ofconstruction and the arrangement of the components or steps ormethodologies set forth in the following description or illustrated inthe drawings. The inventive concepts disclosed herein are capable ofother embodiments, or of being practiced or carried out in various ways.Also, it is to be understood that the phraseology and terminologyemployed herein is for the purpose of description and should not beregarded as limiting the inventive concepts disclosed and claimed hereinin any way.

In the following detailed description of embodiments of the inventiveconcepts, numerous specific details are set forth in order to provide amore thorough understanding of the inventive concepts. However, it willbe apparent to one of ordinary skill in the art that the inventiveconcepts within the instant disclosure may be practiced without thesespecific details. In other instances, well-known features have not beendescribed in detail to avoid unnecessarily complicating the instantdisclosure.

As used herein, the terms “comprises,” “comprising,” “includes,”“including,” “has,” “having,” and any variations thereof, are intendedto cover a non-exclusive inclusion. For example, a process, method,article, or apparatus that comprises a list of elements is notnecessarily limited to only those elements, and may include otherelements not expressly listed or inherently present therein.

Unless expressly stated to the contrary, “or” refers to an inclusive orand not to an exclusive or. For example, a condition A or B is satisfiedby anyone of the following: A is true (or present) and B is false (ornot present), A is false (or not present) and B is true (or present),and both A and B is true (or present).

In addition, use of the “a” or “an” are employed to describe elementsand components of the embodiments disclosed herein. This is done merelyfor convenience and to give a general sense of the inventive concepts.This description should be read to include one or at least one and thesingular also includes the plural unless it is obvious that it is meantotherwise.

As used herein, qualifiers like “substantially,” “about,”“approximately,” and combinations and variations thereof, are intendedto include not only the exact amount or value that they qualify, butalso some slight deviations therefrom, which may be due to manufacturingtolerances, measurement error, wear and tear, stresses exerted onvarious parts, and combinations thereof, for example.

Finally, as used herein any reference to “one embodiment” or “anembodiment” means that a particular element, feature, structure, orcharacteristic described in connection with the embodiment is includedin at least one embodiment. The appearances of the phrase “in oneembodiment” in various places in the specification are not necessarilyall referring to the same embodiment.

Referring now to FIGS. 1-3, a cutter apparatus 10 constructed inaccordance with the inventive concepts disclosed herein is illustrated.The cutter apparatus 10 may be used for cutting brush or timber, forexample. Broadly, the cutter apparatus 10 may include a frame 12connectable to a piece of prime mover equipment (not shown), a cutterassembly 14 connected to the frame 12, and a drive assembly 16 connectedto the cutter assembly 14.

Prime mover equipment is well known in the art. Nonexclusive examplesinclude skid steers, compact track loaders, tractors, excavators, truckbooms, telehandlers, backhoes, construction equipment, and may includevarious three point hitch sizes and styles and other equipment withbooms or hydraulic availability. The attachment configuration for suchprime mover equipment is well known to those having ordinary skill inthe art and, as such, will not be further described herein.

The frame 12 may include an extension arm 18 and a base 20 connectableto the piece of prime mover equipment. The base 20 may include amounting member 22 for mounting the cutter apparatus 10 to the piece ofprime mover equipment, a pair of horizontal supports 24, 26, and aconnection member 28 between the horizontal supports 24, 26. However, itwill be understood that the frame 12 of the cutter apparatus 10 may beconfigured in any suitable form capable of supporting the cutterassembly 14. In one embodiment, the frame 12 may be formed as a part ofthe piece of prime mover equipment such that the piece of prime moverequipment serves as the frame 12.

The extension arm 18 of the frame 12 may have a first end 30 pivotallyconnected to the base 20 and a second end 32 extending from the base 20.In one example, the base 20 has a vertical axis and the extension arm 18is pivotally connected to the base 20 about the vertical axis of thebase 20. The extension arm 18 may be composed of square steel tubing asshown; however, it will be understood that other materials may be used.A hydraulic cylinder 34 may be attached to the extension arm 18 and thebase 20 to pivot the extension arm 18 about the base 20 when thehydraulic cylinder 34 is actuated. Other methods of moving the extensionarm 18 may be used, including but not limited to use of a gear and chaindrive system (not shown). Additionally or alternately, the extension arm18 may be manually moved. One or more bushing 36 may be used tofacilitate pivoting the extension arm 18 about the base 20.

The cutter assembly 14 may be pivotally connected to the extension arm18 of the frame 12. The cutter assembly 14 may include a support member40, a drive shaft 42 (FIG. 4B) connected to the support member 40, and aplurality of cutter members 44 stacked on the drive shaft 42. Thesupport member 40 has a first end 46 and a second end 48. The first end46 of the support member 40 may be pivotally connected to second end 32of the extension arm 18. In one embodiment, the extension arm 18 has ahorizontal axis, and the first end 46 of the support member 40 ispivotally connected to the second end 32 of the extension arm 18 aboutthe horizontal axis of the extension arm 18.

In one embodiment, a hydraulic cylinder 58 may be connected to thecutter assembly 14 to pivot the cutter assembly 14 about the second end32 of the extension arm 18. The cylinders 34, 58 may be powered by anysuitable hydraulic power system (not shown). The cylinders 34, 58 may bepowered by the piece of prime mover equipment. Because the use ofhydraulic circuits, as well as their various components, is well knownin the art, the hydraulic hosing and components used with the presentinventive concepts have been omitted from the drawings for the sake ofclarity.

The support member 40 may be composed of square steel tubing as shown,but it will be understood that other materials may be used. The lengthand size of the support member 40 can vary depending on the type ofutilization of the cutter apparatus 10. It will be understood that thesupport member 40 may comprise more or fewer components than shown aslong as the support member 40 is capable of supporting the drive shaft42 and cutter members 44.

In one embodiment, the cutter assembly 14 may include a debris guard 60.The debris guard 60 may block debris from the cutter assembly 14 frombeing discharged toward the piece of prime mover equipment. The debrisguard 60 may be connected to the support member 40, or to any part ofthe cutter apparatus 10 where the debris guard 60 is able to blockdebris.

The drive shaft 42 also has a first end 50 and a second end 52. At leastthe first end 46 of the support member 40 is journaled to the first end50 of the drive shaft 42. Additional areas of the support member 40 andthe drive shaft 42 may also be journaled, such as the second end 48 ofthe support member 40 and the second end 52 of the drive shaft 42, orone or more mid-point between the first ends 46, 50 and the second ends48, 52. The support member 40 and the drive shaft 42 may be journaled inany manner, as is well known by those having skill in the art, such asby one or more bearings 54. In one embodiment, one or more pieces ofrigid material 56 may be attached in front of the bearings 54 to protectthe bearings 54 and prevent interference, such as that caused by debrisfrom cutting.

As illustrated in FIGS. 1, 3, and 4A-5B, the cutter members 44 arestacked on the drive shaft 42 so as to be engaged with an adjacent oneof the cutter members 44. Each of the cutter members 44 has a body 62with a top side 64, a bottom side 66, and a through-hole 68 extendingfrom the top side 64 to the bottom side 66 and centered in the body 62.Each of the cutter members 44 has at least one cutting edge 70. In oneembodiment, each of the cutter members 44 has a first cutting edge 70 aand a second cutting edge 70 b arranged in a diametrically opposedrelationship. The first cutting edge 70 a and the second cutting edge 70b extend from the top side 64 to the bottom side 66 of the body 62 in aparallel relationship to one another. In one embodiment, the body 62 ofthe cutter member 44 may be rhomboid or parallelopid shaped.

As shown in FIGS. 4A-4C, in one embodiment, the cutter members 44 arestacked on the drive shaft 42 in a way that the first cutting edges 70 aand the second cutting edges 70 b are arranged in a helical pattern. Inone embodiment, the cutter members 44 are arranged in a helical patternso that the cutting edges 70 a and 70 b are longitudinally offset fromone another. By way of example, the first cutting edge 70 a of thecutter member 44 may be approximately eighty degrees offset from thefirst cutting edge 70 a of the adjacent cutter member 44, and the secondcutting edge 70 b of the cutter member 44 may be approximately eightydegrees offset from the second cutting edge 70 b of the adjacent cuttermember 44. In turn, the first cutting edge 70 a of the cutter member 44may be approximately twenty degrees offset from the second cutting edge70 b of the cutter member 44 engaged with the adjacent cutter member 44.

As shown in FIGS. 5A and 5B, in one embodiment, the bottom side 66 ofthe body 62 of each of the cutter members 44 has a notch 72 for matinglyreceiving the top side 64 of the adjacent cutter member 44. The notch 72may be formed at an angle 73 across the bottom side 66 of the body 62 ofthe cutter member 44 to achieve the desired angular offset of thecutting edges 70 a and 70 b of the cutter members 44. In one embodiment,the angle 73 may be approximately one hundred degrees.

The through-hole 68 of the cutter member 44 is slidably receivable ofthe drive shaft 42. The cutter members 44 are slideable along on thedrive shaft 42 when at least the first end 46 or the second end 48 ofthe support member 40 is disconnected from the drive shaft 42 tofacilitate assembly and disassembly.

Referring now to FIG. 6, in one embodiment, the first end 50 and/or thesecond end 52 of the drive shaft 42 may be threaded to receive a nut 74.The nut 74 may secure the cutter members 44 from removal from the driveshaft.

In one embodiment, the cutter assembly 14 may include a top hub 82configured to engage with the top side 64 of a top-most cutter member 44of the stacked cutter members 44. The top hub 82 may include a notch 84,corresponding to the notch 72 of the cutter member 44, for engaging thetop side 64 of the top-most cutter member 44. The top hub 82 may beconnected with one of the bearings 54 journaling the drive shaft 42 withthe support member 40.

In one embodiment, the cutter assembly 14 may include one or more middlehub 86 configured to engage with the top side 64 of a lower adjacentcutter member 44 and to engage the notch 72 in the bottom side 66 of ahigher adjacent cutter member 44 of the stacked cutter members 44. Themiddle hub 86 may include a notch 88, corresponding to the notch 72 ofthe cutter member 44, for engaging the top side 64 of the lower adjacentcutter member 44. The middle hub 86 may be connected with one of thebearings 54 journaling the drive shaft 42 with the support member 40.

As shown in FIG. 6, the drive assembly 16 is connected to the driveshaft 42 of the cutter assembly 14 in a way that activation of the driveassembly 16 causes the drive shaft 42 to rotate and in a way that causesthe cutter members 44 to rotate.

In one embodiment, the drive assembly 16 may include a drive motor 78and a bottom hub 80 engaged with the drive motor 78 to transfer rotationto the cutter assembly 14. The bottom hub 80 may be connected with oneof the bearings 54 journaling the drive shaft 42 with the support member40. The bottom hub 80 may be configured to engage with the notch 72 of abottom-most cutter member 44 of the stacked cutter members 44 such thatthe bottom hub 80 transfers rotation from the drive motor 78 to thecutter members 44. Further, the bottom hub 80 may be configured toengage with the drive shaft 42 such that the bottom hub 80 transfersrotation from the drive motor 78 to the drive shaft 42, so that thedrive shaft 42 and the cutter members 44 rotate at substantially thesame rate.

Of course, it will be understood that any drive assembly 16 of suitablepower to rotate the drive shaft 42 and cutter members 44 for cuttingpurposes may be used. The drive assembly 16 may include any othersuitable drive mechanism, including, but not limited to, an electricmotor, or an internal combustion engine. The drive assembly 16 may bepowered through an exterior source. The drive assembly 16 may be poweredby the piece of prime mover equipment. The drive assembly 16 may bemounted in any way to the cutter assembly 14 or frame 12 as long as thedrive assembly 16 is capable of driving the drive shaft 42 and thecutter members 44.

The cutter apparatus 10 may be controlled and/or powered from the pieceof prime mover equipment. For example, the piece of prime moverequipment may be connected to the cutter apparatus 10 for activating anddeactivating the drive assembly 16 and pivoting controls (such ascylinders 34, 58), such that an operator of the prime mover equipmentmay operate the cutter apparatus 10 with controls of the prime moverequipment. The connections between the prime mover equipment and thecutter apparatus 10 may be hydraulic and/or electrical. As this type ofcontrol is well known in the art, the connections and control systemswill not be further explained herein.

In use, the cutter apparatus 10 may be utilized to cut vegetation, suchas to cut trees and brush away from fence rows, roads, rights-of-way,and easements. Initially, the mounting member 22 of the frame 12 of thecutter apparatus 10 may be attached to the piece of prime moverequipment. Hydraulic and/or electrical connections (not shown), wellknown to those having skill in the art, may be made between the piece ofprime mover equipment and the cutter apparatus 10, so as to providepower to and control of the drive assembly 16, and to pivot theextension arm 18 and or the cutter assembly 14, such as with thecylinders 34, 58. The operator may manipulate the height and orientationof the cutter apparatus 10 by pivoting the extension arm 18 and/or thecutter assembly 14. It will be understood that the cutter apparatus 10may also be raised and lowered with capabilities available on the pieceof prime mover equipment, for example, a boom, lift, or elevator (notshown).

The drive assembly 16 is engaged to rotate the drive shaft 42 and thecutter members 44. The operator may operate the piece of prime moverequipment forward such that the cutter assembly 14 engages thevegetation to be cut. The cutter members 44 cut the vegetation and allowit to drop to the ground.

If the cutter members 44 are dulled, an electric grinder may be used tosharpen the cutter members 44 while the cutter members 44 are on thedrive shaft 42 of the cutter assembly 14. Alternately, or additionally,the operator may disconnect the support member 40 from the drive shaft42 and slidably remove one or more of the cutter members 44 formaintenance.

From the above description, it is clear that the inventive conceptsdisclosed herein are well adapted to carry out the objects and to attainthe advantages mentioned herein as well as those inherent in theinventive concepts disclosed herein. While exemplary embodiments of theinventive concepts disclosed herein have been described for purposes ofthis disclosure, it will be understood that numerous changes may be madewhich will readily suggest themselves to those skilled in the art andwhich are accomplished within the scope of the inventive conceptsdisclosed and claimed herein. While the cutter apparatus 10 has beendescribed in the context of vegetation control, it will be understoodthe cutter apparatus 10 may be used in any environment requiring acutter device. For example, the cutter apparatus 10 may be adapted forother tasks including but not limited to asphalt milling, rock grinding,lumber milling, agricultural tilling, and other uses.

What is claimed is:
 1. A cutter apparatus, comprising: a frame having amounting member connectable to a piece of prime mover equipment; acutter assembly connected to the frame, the cutter assembly comprising:a support member having a first end and a second end; a drive shafthaving a first end and a second end, the first end of the drive shaftjournaled to the first end of the support member; and a plurality ofdiscrete cutter members stacked on the drive shaft so as to be engagedwith an adjacent one of the cutter members, each of the cutter membershaving at least one cutting edge; and a drive assembly connected to thedrive shaft in a way that activation of the drive assembly causes thedrive shaft to rotate and thereby rotate the cutter members.
 2. Thecutter apparatus of claim 1, wherein the support member of the cutterassembly is pivotally connected to the frame.
 3. The cutter apparatus ofclaim 1, wherein the frame comprises a base and an extension arm, theextension arm having a first end pivotally connected to the base and asecond end extending from the base, wherein the first end of the supportmember is pivotally connected to the second end of the extension arm. 4.The cutter apparatus of claim 3, wherein the base has a vertical axisand the extension arm is pivotally connected to the base about thevertical axis of the base, and wherein the extension arm has ahorizontal axis and the first end of the support member is pivotallyconnected to the second end of the extension arm about the horizontalaxis of the extension arm.
 5. The cutter apparatus of claim 1, whereinthe cutter members are slideable along on the drive shaft when the firstend of the support member is disconnected from the first end of thedrive shaft.
 6. The cutter apparatus of claim 1, wherein the cuttermembers are stacked on the drive shaft in a way that the cutting edgesare arranged in a helical pattern.
 7. The cutter apparatus of claim 6,wherein a bottom side of each of the cutter members has a notch formatingly receiving a top side of the adjacent cutter member.
 8. Thecutter apparatus of claim 1, wherein each of the cutter members has abody with a top side, a bottom side, a through-hole extending from thetop side to the bottom side and slidably receivable of the drive shaft,a first cutting edge, and a second cutting edge arranged in adiametrically opposed relationship with respect to the first cuttingedge, the first cutting edge and the second cutting edge extending fromthe top side to the bottom side in a parallel relationship to oneanother.
 9. The cutter apparatus of claim 8, wherein the cutter membersare stacked on the drive shaft in a way that the first cutting edges andthe second cutting edges are arranged in a helical pattern.
 10. Thecutter apparatus of claim 9, wherein the bottom side of the body of eachof the cutter members has a notch for matingly receiving the top side ofthe adjacent cutter member.
 11. A cutter apparatus, comprising: a framehaving a mounting member connectable to a piece of prime moverequipment, the frame comprising a base and an extension arm, theextension arm having a first end pivotally connected to the base and asecond end extending from the base; a cutter assembly connected to theframe, the cutter assembly comprising: a support member having a firstend and a second end, wherein the first end of the support member ispivotally connected to the second end of the extension arm; a driveshaft having a first end and a second end, the first end of the driveshaft journaled to the first end of the support member; and a pluralityof discrete cutter members stacked on the drive shaft so as to beengaged with an adjacent one of the cutter members, each of the cuttermembers having at least one cutting edge; and a drive assembly connectedto the drive shaft in a way that activation of the drive assembly causesthe drive shaft to rotate and thereby rotate the cutter members.
 12. Thecutter apparatus of claim 11, wherein the base has a vertical axis andthe extension arm is pivotally connected to the base about the verticalaxis of the base, and wherein the extension arm has a horizontal axisand the first end of the support member is pivotally connected to thesecond end of the extension arm about the horizontal axis of theextension arm.
 13. The cutter apparatus of claim 11, wherein the cuttermembers are slideable along on the drive shaft when the first end of thesupport member is disconnected from the drive shaft.
 14. The cutterapparatus of claim 11, wherein the cutter members are stacked on thedrive shaft in a way that the cutting edges are arranged in a helicalpattern.
 15. The cutter apparatus of claim 14, wherein a bottom side ofeach of the cutter members has a notch for matingly receiving a top sideof the adjacent cutter member.
 16. The cutter apparatus of claim 11,wherein the plurality of cutter members each have a body with a topside, a bottom side, and a through-hole extending from the top side tothe bottom side and centered in the body, the through-hole slidablyreceivable of the drive shaft, the cutter members further having a firstcutting edge and a second cutting edge arranged in a diametricallyopposed relationship and extending from the top side to the bottom sidein a parallel relationship to one another.
 17. The cutter apparatus ofclaim 16, wherein the cutter members are stacked on the drive shaft in away that the first cutting edges and the second cutting edges arearranged in a helical pattern.
 18. The cutter apparatus of claim 17,wherein the bottom side of the body of each of the cutter members has anotch for matingly receiving the top side of the adjacent cutter member.